Leave the meat whole, season with salt, pepper, coat completely with mustard and place on a greased baking sheet. Peel the potatoes and cut into 0.5 cm thick slices. Clean the vegetables, cut them into small pieces and place them around the roasted lung with the potatoes. Mix the whipped cream with salt, pepper, 1 tablespoon soy sauce and soup seasoning and pour over the vegetables.
Preheat the oven to 200 ° C hot air, insert the tray and fry everything for 15 minutes at this temperature and then finish frying at 170 ° C in about 20 minutes. If necessary stir in the potatoes and vegetables.
Before serving, cut the meat open, arrange it again on the baking sheet and bring everything to the table on the baking sheet.